Effect of intrinsic PCB parameters on the performance of fluoropolymer coating under condensing humidity conditions

Ioannis Mantis*, Feng Li, Morten Stendahl Jellesen, Rajan Ambat

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In this work, Fluoropolymer-based ultrathin coating is evaluated as a protective barrier for Printed Circuit Board (PCB) against corrosion failures. Constant humidity with temperature cycling was applied as external climatic conditions for performance assessment through electrochemical AC impedance and DC potentiostatic measurements. Morphology of the coating before and after test was inspected using Optical, Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). Fluoropolymer coating was applied on a PCB interdigitated pattern used as test substrate. The effect of test board cleanliness, coating thickness, and orientation of the PCB placed inside a climatic chamber were investigated with subsequent corrosion morphology observations after climatic exposure. The study showed that the PCB cleanliness as a critical factor controlling performance with less reliance on the orientation of the PCB and the thickness of the coating.
Original languageEnglish
Article number114158
JournalMicroelectronics Reliability
Volume122
Number of pages9
ISSN0026-2714
DOIs
Publication statusPublished - 2021

Keywords

  • Fluoropolymer
  • Conformal coating
  • Corrosion
  • EIS
  • Leakage current
  • Ultrathin coating
  • Low surface tension

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